Fuel injector

A fuel injector (10) comprising

• a nozzle body (12), in which a blind hole (19) is formed, wherein at least one injection opening (14) leads off from the blind hole,
• a nozzle needle (25;
• 25a to 25c), configured to be moved in a reciprocating manner along a longitudinal axis (18), wherein the nozzle needle (25;
• 25a to 25c) has a valve seat surface (29), which forms a sealing seat (26) with a seat surface (21) in the nozzle body (12) in a lowered position of the nozzle needle (25;
• 25a to 25c), and
• at least one bore (34;
• 34a to 34c) in the nozzle needle (25;
• 25a to 25c), wherein at least some portions of a bore inlet (36) of the at least one bore (34;
• 34a to 34c) are arranged in a region of the seat surface (21) when the sealing seat (26) is formed, and a bore outlet of the at least one bore (34;
• 34a to 34c) is arranged below the valve seat surface (29) of the nozzle needle (25;
• 25a to 25c) in a direction of the longitudinal axis (18),
• wherein the nozzle needle (25;
• 25a to 25c) has, from a region of the valve seat surface (29) to a flat end face (30) facing the blind hole (19), a frustoconical needle tip (28) with a constant angle (γ), wherein the bore inlet (36) extends from the region of the valve seat surface (29), and wherein the blind hole (19) has, in a region of the sealing seat (26), a section with a first angle (β1) with respect to the longitudinal axis (18), which is adjoined in the direction of a blind hole bottom (23) by a section (22) with a second angle (β2), wherein the second angle (β2) is smaller than the first angle (β1) in relation to the longitudinal axis (18).